Was it time for me to go ?

Patrolling the “out of bounds area” of school which I did at most morning break times, I encountered a young female and asked her a) why she was in an out of bounds area and b) why she was wearing a plain black jumper and not one with the school logo on it. Her reply was “Oh, I’m sorry, I didn’t think that those rules applied to supply teachers.” My only defence is that police officers look young too!